education school teaching technology and people concept - group of happy students and teacher with tablet pc computer
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- 大图:3547 × 2259 像素·30.03 cm × 19.13 cm·300dpi·JPG
- 中图:1000 × 637 像素·35.28 cm × 22.47 cm·72dpi·JPG
- 小图:500 × 318 像素·17.64 cm × 11.22 cm·72dpi·JPG